You should be able to stop at any time for any reason and not worry about the car behind crashing in to you. They should leave enough space. A rabbit is a very

You should be able to stop at any time for any reason and not worry about the car behind crashing in to you. They should leave enough space. A rabbit is a very good reason. Maybe it's not a rabbit, maybe it's a rabbit-shaped rock that would cause serious damage to your vehicle, causing you to leave the road and die.